import React, { Component } from 'react'
import {withRouter} from 'react-router-dom'

class Header extends Component {

  back=() => {
    this.props.history.goBack()
  }
  forward=() => {
    this.props.history.goForward()
  }
  go=() => {
    this.props.history.go(-2)
  }

  render () {
    console.log(this.props);

    return (
      <div className="page-header">
        <h2>React Router Demo</h2>
        <button onClick={this.back}>回退</button>&nbsp;
        <button onClick={this.forward}>前进</button>&nbsp;
        <button onClick={this.go}>GO</button>
      </div>
    )
  }
}
//withRouter 可以加工一般组件，让一般组件具备路由组件所特有的API
//withRouter 的返回值是一个新组件
export default withRouter(Header)
